White Page that resolves with clearing cache Topic is solved

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SForsgren
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White Page that resolves with clearing cache

Post by SForsgren » Thu Jun 30, 2022 3:32 pm

Today, my website was down. A white page with no page source.

Admin pages worked fine.
Clearing cache resolved the issue.

How would I go about figuring out why that occurred?

Thanks much,
Scott

Joomla 3.10.10

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Webdongle
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Re: White Page that resolves with clearing cache

Post by Webdongle » Thu Jun 30, 2022 5:12 pm

In global config set debug on and paste the first part of the output
http://www.weblinksonline.co.uk/
https://www.weblinksonline.co.uk/updating-joomla.html
"When I'm right no one remembers but when I'm wrong no one forgets".

SForsgren
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Re: White Page that resolves with clearing cache

Post by SForsgren » Thu Jun 30, 2022 11:14 pm

Webdongle wrote:
Thu Jun 30, 2022 5:12 pm
In global config set debug on and paste the first part of the output
Thank you.

When I turned on debug, I see the debug on the admin side, but on the main site, it is still a white screen with no page source and no debug info displayed. Any thoughts?

Thanks!

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Webdongle
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Re: White Page that resolves with clearing cache

Post by Webdongle » Thu Jun 30, 2022 11:23 pm

A 3rd party extension/Template?
Set Protstar as default Template
Also please https://forumpostassistant.github.io/docs/
http://www.weblinksonline.co.uk/
https://www.weblinksonline.co.uk/updating-joomla.html
"When I'm right no one remembers but when I'm wrong no one forgets".

SForsgren
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Re: White Page that resolves with clearing cache

Post by SForsgren » Tue Jul 05, 2022 1:10 pm

This WSOD continues and continues to be resolved with clearing of the cache.
Last week, on a single day, it happened twice. Then it seems to have been fine for 3-4 days.
I was hopeful it has resolved, but then this morning, it returned.

I set the Debug to Maximum and get this message:

Notice: unserialize(): Error at offset 18 of 57311 bytes in /home/customer/www/<domain>.com/public_html/libraries/src/Cache/Controller/PageController.php on line 104

I was expecting to see something related to an extension, but this doesn't seem to be.

Any thoughts on how to debug further or resolve?

Thanks in advance,
Scott

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Webdongle
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Re: White Page that resolves with clearing cache

Post by Webdongle » Tue Jul 05, 2022 1:56 pm

Do you have cache enabled in Global config?
Have you tried with Protostar as default Template?
https://forumpostassistant.github.io/docs/ please
http://www.weblinksonline.co.uk/
https://www.weblinksonline.co.uk/updating-joomla.html
"When I'm right no one remembers but when I'm wrong no one forgets".

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Re: White Page that resolves with clearing cache

Post by SForsgren » Tue Jul 05, 2022 3:02 pm

Webdongle wrote:
Tue Jul 05, 2022 1:56 pm
Do you have cache enabled in Global config?
Have you tried with Protostar as default Template?
https://forumpostassistant.github.io/docs/ please
Caching is enabled. Maybe I misunderstood the question, but yes, caching is on and when I clear the cache, the site works fine again - for a variable period of time.

Since it can take a few days for the site to go down, I can't change to Protostar as the site is not usable with that template. My template is the same one I have had for some time and has not been updated recently.

I have updated a number of other extensions though and expected that the message would point to one of them, but it did not.

Any other things I can do to debug further?

Thanks :)

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Re: White Page that resolves with clearing cache

Post by Webdongle » Tue Jul 05, 2022 5:00 pm

Disable cache and see what happens. The error shows that it something to do with the way the site is handling cache.

I don't understand "Since it can take a few days for the site to go down". It takes less than a minute to switch to Protostar, type in a url (the browser fills it in) then test and change the The Template back.
http://www.weblinksonline.co.uk/
https://www.weblinksonline.co.uk/updating-joomla.html
"When I'm right no one remembers but when I'm wrong no one forgets".

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Re: White Page that resolves with clearing cache

Post by SForsgren » Tue Jul 05, 2022 5:14 pm

Webdongle wrote:
Tue Jul 05, 2022 5:00 pm
Disable cache and see what happens. The error shows that it something to do with the way the site is handling cache.

I don't understand "Since it can take a few days for the site to go down". It takes less than a minute to switch to Protostar, type in a url (the browser fills it in) then test and change the The Template back.
The error only happens after a period of time. Caching and site are fine for a day or two or three and then fail. So if I change to Protostar, it would need to stay that way for 1-3+ days for the error to happen again.

Thanks for the suggestions :)

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Re: White Page that resolves with clearing cache

Post by sozzled » Tue Jul 05, 2022 6:46 pm

Suggestion: use Google to search for "to cache or not to cache" AND Joomla.
“If you think I’m wrong then say, ‘I think you’re wrong.’ If you say ‘You’re wrong!’, how do you know?”
Walking the talk: https://j4xdemo.enduring.com.au
:)

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Re: White Page that resolves with clearing cache

Post by Webdongle » Tue Jul 05, 2022 7:28 pm

What are your cache settings?
http://www.weblinksonline.co.uk/
https://www.weblinksonline.co.uk/updating-joomla.html
"When I'm right no one remembers but when I'm wrong no one forgets".

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Re: White Page that resolves with clearing cache

Post by SForsgren » Tue Jul 05, 2022 7:31 pm

sozzled wrote:
Tue Jul 05, 2022 6:46 pm
Suggestion: use Google to search for "to cache or not to cache" AND Joomla.
Great info, but not clear how that might be leading to the error I am seeing? Thanks

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Re: White Page that resolves with clearing cache

Post by SForsgren » Tue Jul 05, 2022 7:32 pm

Webdongle wrote:
Tue Jul 05, 2022 7:28 pm
What are your cache settings?
Attached an image here. Thanks so much!
You do not have the required permissions to view the files attached to this post.

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Re: White Page that resolves with clearing cache

Post by sozzled » Tue Jul 05, 2022 7:40 pm

SForsgren wrote:
Tue Jul 05, 2022 7:31 pm
sozzled wrote:
Tue Jul 05, 2022 6:46 pm
Suggestion: use Google to search for "to cache or not to cache" AND Joomla.
Great info, but not clear how that might be leading to the error I am seeing? Thanks
There are several ways that J! can use caching. Your Forum Post Assistant report (see the pink box at the top of this page) may provide some clues. Read a couple of the articles I referred you to; you may have to dig a little deeper. ;)
“If you think I’m wrong then say, ‘I think you’re wrong.’ If you say ‘You’re wrong!’, how do you know?”
Walking the talk: https://j4xdemo.enduring.com.au
:)

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Re: White Page that resolves with clearing cache

Post by SForsgren » Fri Jul 08, 2022 5:49 pm

The error continues as follows:

Notice: unserialize(): Error at offset 18 of 65503 bytes in /home/customer/www/<domain>.com/public_html/libraries/src/Cache/Controller/PageController.php on line 104

I can provide the FPA information next.

Any other things I should be doing to debug when the error occurs?

Thank you very much!

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Re: White Page that resolves with clearing cache

Post by SForsgren » Fri Jul 08, 2022 6:00 pm

Here is the FPA. Thank you in advance for any comments. Much appreciated!
Forum Post Assistant (v1.6.5) : 8-Jul-2022 wrote:
Last PHP Error(s) Reported :: wrote:[08-Jul-2022 17:07:58 UTC] PHP Notice: unserialize(): Error at offset 18 of 65503 bytes in /home/customer/www/<mydomain>.com/public_html/libraries/src/Cache/Controller/PageController.php on line 104
Basic Environment :: wrote:Joomla! Instance :: Joomla! 3.10.10-Stable (Daraja) 18-June-2022
Joomla! Platform :: Joomla Platform 13.1.0-Stable (Curiosity) 24-Apr-2013
Joomla! Configured :: Yes | Read-Only (444) |
Configuration Options :: Offline: false | SEF: true | SEF Suffix: false | SEF ReWrite: true | .htaccess/web.config: Yes | GZip: true | Cache: true | CacheTime: 15 | CacheHandler: file | CachePlatformPrefix: false | FTP Layer: false | Proxy: false | LiveSite: | Session lifetime: 240 | Session handler: database | Shared sessions: false | SSL: 2 | Error Reporting: none | Site Debug: false | Language Debug: false | Default Access: Public | Unicode Slugs: false | dbConnection Type: mysqli | PHP Supports J! 3.10.10: Yes | Database Supports J! 3.10.10: Yes | Database Credentials Present: Yes |

Host Configuration :: OS: Linux | OS Version: 3.12.18-clouder0 | Technology: x86_64 | Web Server: Apache | Encoding: | System TMP Writable: Yes | Free Disk Space : 13.51 GiB |

PHP Configuration :: Version: 7.4.30 | PHP API: cgi-fcgi | Session Path Writable: Yes | Display Errors: 0 | Error Reporting: 30709 | Log Errors To: php_errorlog | Last Known Error: 08th July 2022 17:07:58. | Register Globals: | Magic Quotes: | Safe Mode: | Allow url fopen: 1 | Open Base: | Uploads: 1 | Max. Upload Size: 256M | Max. POST Size: 256M | Max. Input Time: 120 | Max. Execution Time: 120 | Memory Limit: 768M

Database Configuration :: Version: 5.7.32-35-log (Client:mysqlnd 7.4.30) | Database Size: 36.23 MiB | #of Tables with config prefix:  114 | #of other Tables:  0 | User Privileges : GRANT ALL
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Potential Missing Extensions ::

Switch User Environment :: PHP CGI: Yes | Server SU: Yes | PHP SU: Yes | Potential Ownership Issues: No
Folder Permissions :: wrote:Core Folders :: images/ (755) | components/ (755) | modules/ (755) | plugins/ (755) | language/ (755) | templates/ (755) | cache/ (755) | logs/ (755) | tmp/ (755) | administrator/components/ (755) | administrator/modules/ (755) | administrator/language/ (755) | administrator/templates/ (755) | administrator/logs/ (---) |

Elevated Permissions (First 10) ::
Database Information :: wrote:Database statistics :: Uptime: 941874 | Threads: 1 | Questions: 2611448 | Slow queries: 12 | Opens: 138523 | Flush tables: 1 | Open tables: 3072 | Queries per second avg: 2.772 |
Extensions Discovered :: wrote:Components :: Site ::
Core :: com_mailto (3.0.0) 1 | com_wrapper (3.0.0) 1 |
3rd Party::

Components :: Admin ::
Core :: com_postinstall (3.2.0) 1 | com_installer (3.0.0) 1 | com_finder (3.0.0) 0 | com_categories (3.0.0) 1 | com_tags (3.1.0) 1 | com_actionlogs (3.9.0) 1 | com_languages (3.0.0) 1 | com_fields (3.7.0) 1 | com_cpanel (3.0.0) 1 | com_config (3.0.0) 1 | com_banners (3.0.0) 1 | com_media (3.0.0) 1 | com_users (3.0.0) 1 | com_admin (3.0.0) 1 | com_menus (3.0.0) 1 | com_modules (3.0.0) 1 | com_weblinks (3.9.0) 1 | com_messages (3.0.0) 1 | com_redirect (3.0.0) 1 | com_contenthistory (3.2.0) 1 | com_templates (3.0.0) 1 | com_joomlaupdate (3.10.1) 1 | com_content (3.0.0) 1 | com_associations (3.7.0) 1 | com_plugins (3.0.0) 1 | com_cache (3.0.0) 1 | com_privacy (3.9.0) 1 | com_search (3.0.0) 1 | com_login (3.0.0) 1 | com_ajax (3.2.0) 1 | com_newsfeeds (3.0.0) 1 | com_checkin (3.0.0) 1 |
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Core ::
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Plugins ::
Core :: plg_editors-xtd_readmore (3.0.0) 1 | plg_editors-xtd_fields (3.7.0) 1 | plg_editors-xtd_weblink (3.9.0) 0 | plg_editors-xtd_module (3.5.0) 1 | plg_editors-xtd_menu (3.7.0) 1 | plg_editors-xtd_article (3.0.0) 1 | plg_editors-xtd_pagebreak (3.0.0) 1 | plg_editors-xtd_image (3.0.0) 1 | plg_finder_contacts (3.0.0) 0 | plg_finder_tags (3.0.0) 0 | plg_finder_content (3.0.0) 0 | plg_finder_newsfeeds (3.0.0) 0 | plg_finder_categories (3.0.0) 0 | plg_finder_weblinks (3.9.0) 0 | plg_fields_radio (3.7.0) 1 | plg_fields_list (3.7.0) 1 | plg_fields_imagelist (3.7.0) 1 | plg_fields_editor (3.7.0) 1 | plg_fields_media (3.7.0) 1 | plg_fields_url (3.7.0) 1 | plg_fields_textarea (3.7.0) 1 | plg_fields_user (3.7.0) 1 | plg_fields_sql (3.7.0) 1 | plg_fields_checkboxes (3.7.0) 1 | plg_fields_repeatable (3.9.0) 1 | plg_fields_integer (3.7.0) 1 | plg_fields_calendar (3.7.0) 1 | plg_fields_text (3.7.0) 1 | plg_fields_usergrouplist (3.7.0) 1 | plg_fields_color (3.7.0) 1 | plg_quickicon_extensionupdate (3.0.0) 1 | plg_quickicon_joomlaupdate (3.0.0) 1 | plg_quickicon_eos310 (3.10.0) 1 | plg_quickicon_privacycheck (3.9.0) 1 | plg_quickicon_phpversioncheck (3.7.0) 1 | plg_authentication_joomla (3.0.0) 1 | plg_authentication_ldap (3.0.0) 0 | plg_authentication_cookie (3.0.0) 1 | plg_authentication_gmail (3.0.0) 0 | PLG_INSTALLER_URLINSTALLER (3.6.0) 1 | plg_installer_packageinstaller (3.6.0) 1 | plg_installer_webinstaller (2.1.2) 1 | PLG_INSTALLER_FOLDERINSTALLER (3.6.0) 1 | PLG_ACTIONLOG_JOOMLA (3.9.0) 1 | plg_captcha_recaptcha (3.4.0) 1 | plg_captcha_recaptcha_invisible (3.8) 0 | plg_user_joomla (3.0.0) 1 | plg_user_terms (3.9.0) 0 | plg_user_contactcreator (3.0.0) 0 | plg_user_profile (3.0.0) 0 | plg_twofactorauth_totp (3.2.0) 1 | plg_twofactorauth_yubikey (3.2.0) 0 | plg_system_logout (3.0.0) 1 | plg_system_languagecode (3.0.0) 0 | plg_system_log (3.0.0) 1 | plg_system_fields (3.7.0) 1 | plg_system_debug (3.0.0) 1 | plg_system_remember (3.0.0) 0 | plg_system_updatenotification (3.5.0) 1 | plg_system_redirect (3.0.0) 1 | plg_system_sef (3.0.0) 1 | PLG_SYSTEM_ACTIONLOGS (3.9.0) 0 | plg_system_highlight (3.0.0) 1 | plg_system_logrotation (3.9.0) 1 | plg_system_p3p (3.0.0) 1 | plg_system_cache (3.0.0) 1 | plg_system_privacyconsent (3.9.0) 0 | plg_system_languagefilter (3.0.0) 0 | plg_system_sessiongc (3.8.6) 1 | plg_system_stats (3.5.0) 1 | plg_system_weblinks (3.9.0) 0 | plg_extension_joomla (3.0.0) 1 | plg_content_joomla (3.0.0) 1 | plg_content_finder (3.0.0) 0 | plg_content_fields (3.7.0) 1 | plg_content_emailcloak (3.0.0) 1 | plg_content_pagenavigation (3.0.0) 1 | plg_content_loadmodule (3.0.0) 1 | plg_content_confirmconsent (3.9.0) 0 | plg_content_vote (3.0.0) 1 | plg_content_pagebreak (3.0.0) 1 | plg_privacy_message (3.9.0) 1 | plg_privacy_consents (3.9.0) 1 | plg_privacy_user (3.9.0) 1 | plg_privacy_actionlogs (3.9.0) 1 | plg_privacy_content (3.9.0) 1 | plg_search_contacts (3.0.0) 1 | plg_search_tags (3.0.0) 0 | plg_search_content (3.0.0) 1 | plg_search_newsfeeds (3.0.0) 1 | plg_search_categories (3.0.0) 1 | plg_search_weblinks (3.9.0) 1 |
3rd Party:: Editor Button - JW Player (2.4.0) 0 | PLG_EDITORS-XTD_AMPZ (4.2) 1 | plg_quickicon_akeebabackup (8.1.8) 0 | PLG_INSTALLER_COOKIESPOLICYNOTIFICA (4.2.4) ? | PLG_ACTIONLOG_AKEEBABACKUP (8.1.8) 0 | PLG_ACTIONLOG_ADMINTOOLS (6.1.6) 0 | plg_captcha_jproicaptcha (3.0.5) 0 | PLG_USER_JCHOPTIMIZEUSERSTATE (7.2.4) 0 | System - Facebook Feed Pro (3.6.2) 1 | PLG_SYSTEM_JSVISIONARY (2.1.0) 1 | System - Offlajn Params (1.2.0) 1 | System - Offlajn Params (1.2.1) 1 | Offlajn Joomla 3.0 compatibility (1.0) 1 | System - Google Analytics (5.0.1) 1 | plg_system_ospamanot (2.0.1) 1 | PLG_SYSTEM_COOKIESPOLICYNOTIFICATIO (4.2.4) ? | PLG_SYSTEM_JCHOPTIMIZEPAGECACHE (7.2.4) 0 | PLG_PWEBOPENGRAPH (3.0.1) 1 | PLG_SYSTEM_ADMINTOOLS (6.1.6) 1 | plg_system_osmylicensesmanager (2.0.15) 1 | PLG_SYSTEM_JCHOPTIMIZE (7.2.4) 0 | Canonical Links (3.47) 1 | PLG_SYSTEM_WEB357FRAMEWORK (1.9.1) 1 | PLG_SYSTEM_BACKUPONUPDATE (8.1.8) 1 | PushCrew For Joomla (1.0) 0 | System - ampz (4.2) 1 | plg_editors_tinymce (4.5.12) 1 | plg_editors_codemirror (5.60.0) 1 | plg_content_jwadvanced (4.25.0) 1 | PLG_AJAX_COOKIESPOLICYNOTIFICATIONB (4.2.4) ? | PLG_AJAX_WEB357FRAMEWORK (1.9.1) 1 | PLG_OSMAP_JOOMLA (5.0.2) 1 | PLG_OSMAP_JDOWNLOADS (5.0.2) 0 | PLG_OSMAP_MTREE (5.0.0) 0 | PLG_OSMAP_OSCAMPUS (5.0.2) 0 | PLG_OSMAP_PHOCAGALLERY (5.0.2) 0 | PLG_OSMAP_VM (5.0.2) 0 | PLG_OSMAP_SOBIPRO (5.0.2) 0 | PLG_OSMAP_WEBLINKS (5.0.0) 0 | PLG_OSMAP_KUNENA (5.0.2) 0 | PLG_OSMAP_K2 (5.0.2) 0 | PLG_OSMAP_SHACKLOCATIONS (5.0.2) 0 |
Templates Discovered :: wrote:Templates :: Site :: protostar (1.0) 1 | js_impacto (3.6.14) 1 | beez3 (3.1.0) 1 |
Templates :: Admin :: hathor (3.0.0) 1 | isis (1.0) 1 |
Last edited by toivo on Fri Jul 08, 2022 9:18 pm, edited 1 time in total.
Reason: mod note: disabled smilies in post Options for readability

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sozzled
Joomla! Master
Joomla! Master
Posts: 12214
Joined: Sun Jul 05, 2009 3:30 am
Location: Canberra, Australia

Re: White Page that resolves with clearing cache

Post by sozzled » Fri Jul 08, 2022 6:58 pm

See viewtopic.php?t=960163 for the solution. The System - Page Cache plugin is enabled (it is disabled by default); disable the plugin.
“If you think I’m wrong then say, ‘I think you’re wrong.’ If you say ‘You’re wrong!’, how do you know?”
Walking the talk: https://j4xdemo.enduring.com.au
:)

SForsgren
Joomla! Enthusiast
Joomla! Enthusiast
Posts: 229
Joined: Fri May 12, 2006 2:46 am

Re: White Page that resolves with clearing cache

Post by SForsgren » Fri Jul 08, 2022 7:02 pm

sozzled wrote:
Fri Jul 08, 2022 6:58 pm
See viewtopic.php?t=960163 for the solution. The System - Page Cache plugin is enabled (it is disabled by default); disable the plugin.
It has been disabled now. Will continue to monitor. Thank you so much!


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